Finding the Fourth Proportional to 42.32, 57.99 and 42.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42.32 : 57.99 = 42.20 : x
2. Step 2: Convert to fraction form
   42.32/57.99 = 42.20/x
3. Step 3: Cross multiply
   42.32x = 57.99 × 42.20
4. Step 4: Simplify right side
   42.32x = 2,446.97
5. Step 5: Solve for x
   x = 2,446.97/42.32
6. Step 6: Final answer
   x = 57.82